$(function() {
	$(".img").hover(function() {
		$(".quit").show();
	}, function() {
		$(".quit").hide();
	});
});

function previewImage(file) {
	var MAXWIDTH = 50;
	var MAXHEIGHT = 50;
	var div = document.getElementById('upload-img');
	if(file.files && file.files[0]) {
		div.innerHTML = '<img id=upload-img onclick=$("#upload-img").click()>';
		var img = document.getElementById('upload-img');
		img.onload = function() {
			var rect = clacImgZoomParam(MAXWIDTH, MAXHEIGHT, img.offsetWidth, img.offsetHeight);
			img.width = rect.width;
			img.height = rect.height;
			//                 img.style.marginLeft = rect.left+'px';
			img.style.marginTop = rect.top + 'px';
		}
		var reader = new FileReader();
		reader.onload = function(evt) {
			img.src = evt.target.result;
		}
		reader.readAsDataURL(file.files[0]);
	} else //兼容IE
	{
		var sFilter = 'filter:progid:DXImageTransform.Microsoft.AlphaImageLoader(sizingMethod=scale,src="';
		file.select();
		var src = document.selection.createRange().text;
		div.innerHTML = '<img id=upload-img>';
		var img = document.getElementById('upload-img');
		img.filters.item('DXImageTransform.Microsoft.AlphaImageLoader').src = src;
		var rect = clacImgZoomParam(MAXWIDTH, MAXHEIGHT, img.offsetWidth, img.offsetHeight);
		status = ('rect:' + rect.top + ',' + rect.left + ',' + rect.width + ',' + rect.height);
		div.innerHTML = "<div id=upload-img style='width:" + rect.width + "px;height:" + rect.height + "px;margin-top:" + rect.top + "px;" + sFilter + src + "\"'></div>";
	}
}

function clacImgZoomParam(maxWidth, maxHeight, width, height) {
	var param = {
		top: 0,
		left: 0,
		width: width,
		height: height
	};
	if(width > maxWidth || height > maxHeight) {
		rateWidth = width / maxWidth;
		rateHeight = height / maxHeight;

		if(rateWidth > rateHeight) {
			param.width = maxWidth;
			param.height = Math.round(height / rateWidth);
		} else {
			param.width = Math.round(width / rateHeight);
			param.height = maxHeight;
		}
	}
	param.left = Math.round((maxWidth - param.width) / 2);
	param.top = Math.round((maxHeight - param.height) / 2);
	return param;
}